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Article: The first Mesozoic chondrophorine (medusoid hydrozoan), from the Lower Cretaceous of Japan

Publication: Palaeontology
Volume: 28
Part: 1
Publication Date: January 1985
Page(s): 101 109
Author(s): George D. Stanley Jr. and Yasumitsu Kanie
Addition Information

How to Cite

, G. D. J., KANIE, Y. 1985. The first Mesozoic chondrophorine (medusoid hydrozoan), from the Lower Cretaceous of Japan. Palaeontology28, 1, 101–109.

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The Palaeontological Association (Free Access)


Floating jellyfish-like hydrozoans belonging to the Suborder Chondrophorina are a little known but distinctive group extending back to the Precambrian with sporadic occurrences in the Palaeozoic. Their absence from post -Carboniferous rocks was puzzling, considering their abundance and wide distribution today. Palaelophacmaea annulata (Yokoyama), from the lower Cretaceous (Barremian) of Japan, is reinterpreted as the first known example of a chondrophorine fossil from the Mesozoic. The species was previously considered to be a patelliform gastropod. The remarkable similarity of chondrophorine pneumatophores to some univalved molluscs complicates precise indentification. Possible criteria to aid in distinguishing these little-known fossils are discussed.
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